The typically occurs during the installation of highly compressed game files (like repacks) when the decompression process fails due to memory issues, corrupted files, or hardware throttling. Core Troubleshooting Steps
In this comprehensive guide, we will demystify error code 11, explain exactly why The Sims 4 is prone to it, and walk you through the solutions to get your game installed and running smoothly. unarc.dll returned an error code 11 sims 4